RU2778227C1 - Prefabricated monolithic reinforced concrete frame of the building - Google Patents

Abstract

FIELD: construction industry.

SUBSTANCE: invention relates to the field of construction, in particular to a prefabricated monolithic reinforced concrete frame of a building. The prefabricated monolithic frame includes columns having concrete gaps in the overlap plane for a monolithic nodal joint, in which prefabricated monolithic load-bearing crossbars are combined, having in their prefabricated part releases of working fittings with the ends bent upwards, and tie crossbars supported on load-bearing crossbars multi-void floor slabs made with concrete dowels and concrete plugs, installed in the voids of the ends of the plates. The up-bent ends of the outlets of the working fittings are wound into the body of the overlying column and connected to the outlets of its working rods. The columns adjacent in height are connected by vertical ties, the upper reinforcement of the monolithic part of the load-bearing crossbars is prestressed. Multi-void plates are equipped with frames installed in solid parts of the plates, protrude from the ends of the plates to a length equal to the width of the monolithic part of the crossbar, connected in the monolithic part of the crossbar in overlap.

EFFECT: increase in the stability of the frame.

1 cl, 9 dwg

Description

The invention relates to the field of construction and is intended to create precast-monolithic reinforced concrete frames of residential and public buildings of any number of storeys, providing the perception of power flows changing in them under special impact caused by the sudden removal of one of the supporting columns, and as a result, increasing the stability and resistance of the frame to progressive avalanche collapse.

It is known prefabricated-monolithic reinforced concrete floor, including multi-hollow slabs, longitudinal and transverse crossbars supported on columns and consisting of a lower prefabricated part and an upper monolithic part, equipped with top reinforcement installed in the supporting sections or along the length of the monolithic part of the crossbars, multi-hollow slabs are mounted on the bottom prefabricated part of the longitudinal crossbars and are monolithic with the upper monolithic part of the crossbars, containing monolithic reinforced dowels formed in the voids of the slabs (RF patent No. M., RU).

The disadvantages of the analog are the relatively low rigidity and low crack resistance of the junctions of the crossbars and columns, the absence of two-way connections between the columns in height, the absence of continuity of the floor slabs.

A reinforced concrete prefabricated-monolithic frame of a building is known, including columns rigidly connected to monolithic crossbars, on which prefabricated hollow-core slabs are supported by means of concrete dowels (RF patent No. A., Pivovarova O.V., RU).

The disadvantages of this frame are also insufficient rigidity and crack resistance of the junctions of crossbars and columns and the absence of two-way connections between the columns in height.

Closest to the claimed solution is the design of the prefabricated-monolithic floor, made according to the known technology of erection of prefabricated-monolithic frame with cast-in-place joints of columns with prefabricated-monolithic crossbars. (RF patent No. 2519082 RU, priority date 06/04/2012, publication date 12/10/2013, authors Lazarev I.A., Lazarev A.I., Titov A.N., RU, prototype). The main disadvantage of the prototype is that the supporting crossbar is not connected by two-way connections with the column of the upper floor, thereby not protecting the frame from progressive collapse in case of a sudden change in the direction of power flows from the removal of one of the supporting columns of the first floor in the frame of the building. When one of the load-bearing columns is removed, such a structure works as a system with one-way connections, which does not ensure its resistance to progressive collapse.

The technical result to which the invention is directed is to create a reinforced concrete prefabricated monolithic frame-rod frame of the building, which provides the perception of power flows changing in it under a special impact caused by the sudden removal of one of the supporting columns, and as a result, an increase in the stability and resistance of the frame to progressive avalanche collapse.

The technical result is achieved by the fact that the prefabricated monolithic reinforced concrete frame of the building, including columns having concrete gaps in the floor plane for a monolithic nodal connection, in which prefabricated monolithic load-bearing crossbars are combined, having in their prefabricated part outlets of the lower working reinforcement with bent up ends, and tie crossbars, supported on the load-bearing crossbars, hollow-core floor slabs, made with concrete dowels and concrete plugs installed in the voids of the ends of the slabs, and the ends of the outlets of the lower working reinforcement of the prefabricated part of the load-bearing crossbars bent upwards are brought into the body of the overlying column and connected to the outlets of its working rods , columns adjacent in height are interconnected by interfloor vertical ties - overlays, the upper reinforcement of the monolithic part of the bearing crossbars is prestressed, multi-hollow slabs are equipped with frames that are installed in solid parts of the slabs between voids a quarter of the span from the end, protrude from the ends slabs for a length equal to the width of the monolithic part of the crossbar, are connected in the monolithic part of the crossbar in an overlap and, together with the dowels, form a single prefabricated-monolithic floor hard disk after concreting the upper part of the crossbar and openings in the column.

The use of bends of reinforcing bars from the crossbars into the body of the column and their connection with the column rods ensures the closedness of the "crossbar-column" contour and their joint deformation after the redistribution of power flows from the removal of any one of the columns of the building frame. The connection of the columns of the frame of the building adjacent in height to each other by interfloor vertical ties - overlays ensures the perception of tensile forces by a chain of columns along the height of the building after the removal of the first floor column, the prestressing of the upper reinforcement of the supporting crossbars increases the rigidity of the node in the "crossbar-column" contour and thereby ensures it immutability. Installation in solid parts of the slabs between the voids of the reinforcing cages in the body of the slab with protrusions of these frames from the ends of the slabs for a length equal to the width of the monolithic part of the crossbar and the connection of these frames in the area of the monolithic part of the crossbar in an overlap, as well as with the device of dowels on the side surfaces of the plates, allow after concreting the upper part of the crossbar, combine the floor into a single prefabricated-monolithic hard disk and thereby, together with other distinctive features, ensure the achievement of the technical result - the joint deformation of all elements of the building frame when the power flows in it change from a special effect caused by the removal of one of the load-bearing columns of the first floor.

The essence of the claimed invention is illustrated by drawings.

Fig. 1 - a fragment of a plan for a prefabricated monolithic floor;

Fig. 2 - section 1-1;

Fig. 3 - section 2-2;

Fig. 4 - section 3-3;

Fig. 5 - section 4-4;

Fig. 6 node And figure 2;

Fig. 7 - node B figure 3;

Fig. 8 - construction of the floor slab;

Fig. 9 - a fragment of the design of the supporting crossbar.

The drawings contain the following symbols:

1 - columns;

2 - bearing crossbars;

3 - tie crossbars;

4 - multi-hollow slabs;

5 - dowels;

6 - bent reinforcing outlets;

7 - concrete dowels;

8 - concrete plugs;

9 - holes;

10 - frames between the voids of the plates;

11 - prestressed reinforcement;

12 - monolithic part of the crossbar;

13 - interfloor vertical connections - overlays;

14 - releases of the working rods of the column;

15 - voids in the slabs.

The prefabricated monolithic reinforced concrete frame of the building includes columns (1) and a ceiling formed by load-bearing (2) and tie beams (3) and hollow-core slabs (4). The ends of the lower working reinforcing bars of the supporting crossbars (2) are bent upwards, these bent reinforcing outlets (6) are inserted into the body of the overlying column (1) and connected to the outlets of its working bars (14), the columns (1) of the building frame adjacent in height are connected between itself interfloor vertical ties-overlays (13). The "crossbar - floor slab" interface is made with concrete dowels (7), and concrete plugs (8) are installed in the voids of the ends of the slabs. The upper reinforcement (11) of the load-bearing crossbars (2) is prestressed. Hollow-core slabs (4) of the reinforced concrete frame of the building are equipped with frames (10), which are installed in solid parts between the voids (15) of the slabs. A quarter of the span 1/4 from the end of the hollow-core slabs (4) towards the middle of the slab, and these frames protrude from the ends of the hollow-core slabs (4) by a length equal to the width of the monolithic part of the crossbar in (12). The frames between the voids of the plates (10) are overlapped in the monolithic part of the crossbar (12) and together with the dowels (5) on the side surfaces of the multi-hollow plates (4) and the holes (9) above the voids in the upper flange of the plates form in the upper monolithic part of the crossbar (12 ) a single prefabricated-monolithic hard disk overlap.

The introduction of bent reinforcing bars of the crossbars upwards into the body of the column and the installation of interfloor ties-overlays ensures the operation of the column reinforcement in tension-compression together with the lower working reinforcement of the crossbars when the power flows in the prefabricated-monolithic reinforced concrete frame of the building change. The prestressing of the upper reinforcement of the supporting crossbar increases the crack resistance of the crossbar and the floor disk under consideration as a whole. Installation of reinforcing cages in solid parts of multi-hollow slabs and their overlapping over the upper monolithic part of the crossbar with its width, followed by embedding of frames protruding from multi-hollow slabs, holes above the voids in the upper flange of the slabs into a single prefabricated-monolithic floor hard disk, ensures the redistribution of forces between the floor elements with sudden removal of the underlying column. The prestressed upper reinforcement of the load-bearing girders also increases the rigidity of the girder-column assembly and thus its invariability in the event of a sudden change in power flows caused by the removal of the column. Interfloor vertical connections - linings between columns adjacent in height hold the overlying columns of the building frame and, in combination with other distinctive features, create a frame that resists progressive avalanche collapse.

Claims (1)

Prefabricated-monolithic reinforced concrete frame of the building, including columns having concrete gaps in the floor plane for a monolithic nodal connection, in which prefabricated-monolithic bearing crossbars are combined, having outlets of lower working reinforcement with bent up ends in their prefabricated part, and tie crossbars supported on load-bearing crossbars are multi-hollow floor slabs made with concrete dowels and concrete plugs installed in the voids of the end faces of the slabs, characterized in that the ends of the outlets of the lower working reinforcement of the prefabricated part of the load-bearing crossbars bent upwards are brought into the body of the overlying column and connected to the outlets of its working rods, adjacent in the height of the columns are connected to each other by interfloor vertical connections - overlays, the upper reinforcement of the monolithic part of the bearing crossbars is prestressed, the multi-hollow slabs are equipped with frames that are installed in the solid parts of the slabs between the voids for a quarter of the span from the end, protrude from the ends of the slabs to a length equal to the width of the monolithic part of the crossbar, are overlapped in the monolithic part of the crossbar and, together with the dowels, form a single prefabricated monolithic floor hard disk after concreting the upper part of the crossbar and the openings in the column.

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